mclaren



(No Model.) 2 Sheets-Sheet 1.

J. MGLAREN.

VALVE GEAR POR ENGINES.

Uro/mfr (No Model.) 2 sheetssheet 2. J. MGLAREN.

VALVE GEAR POR ENGINES. .v y 10.409,058. Patented Aug. 13, 1889.`

UNITED STATES PATENT OFFICE.

JOI-IN MCLAREN, OF NEW YORK, N. Y.

VALVE-G EAR FOR ENGIN ES.

SPECIFICATION forming part of Letters Patent No. 409,058, dated August 13, 1889. Application tiled February 28, 1889. Serial No. 301,508. (No model.)

To all whom,V it may concern:

Be it known that I, JOHN MCLAREN, a citizen ofthe United States, residing at the city of New York, county and State of New York, have invented new and useful Improvements in Valve-Gear for Steam-Engines, of which the following is a specification.

This invention relates to a novel mechanism for tripping the steam-valves of an engine by the action of the governor, the construction of said mechanism being pointed out in the following specification and claim, and illustrated in the accompanying drawings, in which- Figure l is a side view of the tripping mechanism. Fig. 2 is a front view of the same. Fig. 3 is a longitudinal section in the plane 00 Fig. 2. Fig. 4 is a vertical section in the plane y y, Fig. \Fig. 5 is a side elevation of a Corliss engine provided with my valve-gear, on a smaller vscale than the previous figures. Fig. 6 is a plan or top view of the saine. Fig. 7 is a longitudinal section of the steam-cylinder detached.

Similar letters indicate corresponding parts.

In the drawings, the letter A designates the steam-cylinder, (shown in dotted lines in Figs. 1, 2, and 3,) which is provided with four valve-chambers B B C C, Fig. 7, in which move the valves Z2 b c c', the valves l) b being the steam-Valves and the valves c c the exhaust-valves An oscillating motion is imparted to these valves by means of an eccentric D on the crank-shaft E, Figs. 5 and 6, which connects with a disk F, from which extend connecting-rods G to arm H, from which motion is transmitted to the stems d df of the steam-valves b b in the following man-A ner: The arm H extends from a sleeve I, Fig. l, which is loosely mounted on the bearings of the stem d. rlhis sleeve carries a bracket J, which supports the movable tappet K, which, in the example shown in the drawings, is mounted on a pivot j, so that it can swing from its active position (shown in full lines, Fig. .3) into its inactive position, (indicated in that iigureein dotted lines.) A spring j has a tendency to hold the tappet in its active position. On the valve-stem dis firmly mounted a hub L, from which extends an arm Z, which uis provided with a lip m, and from which the dashpot-rod M is suspended.

On the bearing of the valve-stein d is loosely mounted a cam N, which connects by a rod n, Fig. 5, with the governor O. lVllen the engine runs at its normal speed, the caln N is retained in the position shown in Fig. 2, and as the sleeve I oscillates on the valvestem the roller js, mounted on the outer end of the tappet K, does not come in contact with the cam N, and since said tappet on its upward movement acts-upon the lip m of the arm l the valve-stem CZ is turned and the valve l) is opened and keptV open until the tappet returns to the position shown in Fig. 2. If the speed of the engine increases beyond its normal point, the cam N is turned in the direction of arrow 1, Fig. 2, the projection n.2 on said cam is brought into the path of the roller t7f3, and as soon as this roller strikes against said projection the tappet K is thrown out of its active position, the arm Z is released, the dashpot-rod M drops down, and the valve Z2 is closed.

What I claim as new, and desire to secure by Letters Patent, is-

The combination, with the valve b and its stem d, mounted in a suitable bearing, of the sleeve I, loosely mounted on the bearing and carrying the valve-tripping tappet K, which is pivoted intermediate its ends, a springj for normally holding the tappet in its active position, means, substantially as described, for oscillating the sleeve, the hub Il, fixed on the Valve-stem and having the projecting arm Z, against which Vone end of the tappet engages, the ycam N, loosely mounted on thc Valve-stem bearing for acting on the opposite end of the tappet, the governor O, and connections between said governor and the cam for rotating the latter when the speed of the governor increases beyond a certain limit.

In testimony whereof I have hereunto set my hand and seal in the presence of two subscribing witnesses.

J OIIN MCLAREN. [L sl 

